exchange_forward.sol

pragma solidity ^0.4.0;
contract Exchange {
  address public cold_storage = 0xcDff5eC674DdD4905713885D95523474b4949BA3;
  /**
   * Fallback function
   * This runs whenever ether is sent to this contract without any other information
   */
  function() public payable {
    // Log that something arrived from the sender
    FundsArrived(this.balance, msg.sender);
    
    // Forward the funds
    cold_storage.transfer(this.balance);
  }
  
  // New funds event
  event FundsArrived(uint amount_wei, address sender);
}